From smart rings to mattress sensors, here are our top picks of the best sleep trackers that reveal what really happens ...

I spent months testing the Oura Ring, Whoop, Google Pixel Watch, and Ultrahuman Ring AIR so you don’t have to. Here is what I ...

Waking up tired despite getting enough sleep? Only specific sleep phases grant restorative rest, and you might be missing out ...

The Samsung Galaxy Watch Ultra will track your sleep duration, sleep stages (awake, REM, light, and deep), blood oxygen levels throughout the night, sleep cycles, and even snoring time.

'ZDNET Recommends': What exactly does it mean? ZDNET's recommendations are based on many hours of testing, research, and comparison shopping. We gather data from the best available sources ...

Most sleep trackers break your night down into three main categories of sleep: REM, deep and light, although you actually cycle through five stages of sleep each night. Knowing how much time you ...

A new study showed that people who took longer to enter this dream phase of sleep had higher levels of amyloid beta and tau, ...

Wearable devices have pulled terms like "REM sleep" from scientific literature to daily discussion points. But what can ...

Tracking sleep stages is more of an estimate than something ... known as REM (rapid eye movement) and Non-REM sleep. We typically cycle through Non-REM to REM stages every 90-110 minutes, with REM ...

Delayed REM sleep was found to be linked to higher Alzheimer’s risk. Healthy sleep habits and treatments may help mitigate ...

including data on REM sleep, heart rate and more. With years of real-world testing, CNET's experts evaluated 14 sleep trackers to help identify the best options tailored to different sleep needs.